1. Department of Dental Sciences, Faculty of Medicine, University of Liege, Liege, Belgium.
2. Laboratory Surfaces Interfaces, UFRO, University of Nice, Nice, France.
3. Department of Stomatology, University Hospital Saint Pierre, ULB, Brussels, Belgium.
4. Human Physiology, Environmental and Occupational Laboratory, Haute Ecole Paul Henri Spaak, Motor Sciences Laboratory, ULB, Brussels, Belgium.
5. Dental Education, University of Utah, Salt Lake City, Utah.